Why Do Cars Make Noise When Shifting into Reverse? High-Pitched Noise Is a Direct Result of the Type of Gear Used Exclusively for This Function of the Transmission

Written by Felipe Alves da Silva

Published on 18/06/2025 at 11:21

Marcha à ré tem um som único que começa no movimento da alavanca.

Be the first to react!

Sharp Noise When Reversing Is Caused By The Straight-Toothed Gear Design, Unlike That Used In Normal Gears, Which Are Quieter And Smoother

When engaging the reverse gear and accelerating the vehicle, a sharp and characteristic noise can be heard. This noise, common in various cars, does not indicate a mechanical defect, but is explained by the type of gear used in the cars’ reversal system.

The majority of forward gears use gears with helical teeth, which ensure progressive and smooth contact between components, significantly reducing noise and wear over time. In contrast, the reverse gear adopts straight-toothed gears, whose contact occurs simultaneously and directly.

This difference in the shape of the mechanical parts is the main reason for the noise. The abrupt contact between the straight teeth generates more vibration and, consequently, more noise, as well as greater wear over continuous use.

ARTICLE CONTINUES BELOW

See also

Automotive mechanics specialist Daniel Monteiro explains that the sound of the reverse gear is a natural consequence of this design. He emphasizes that, despite the auditory discomfort, it is a completely expected effect and poses no risk to the vehicle.

According to a report published by CNN Brasil, the use of this type of gear is common because it is cheaper and more efficient in quick maneuvers, where sound comfort is not a priority.

Why Do Cars Make Noise When Shifting into Reverse? High-Pitched Noise Is a Direct Result of the Type of Gear Used Exclusively for This Function of the Transmission

Sharp Noise When Reversing Is Caused By The Straight-Toothed Gear Design, Unlike That Used In Normal Gears, Which Are Quieter And Smoother

A village with 115 inhabitants wants new residents: it offers a house, a job, up to 44 thousand euros in benefits, almost free rent, an annual grant of 8 thousand euros for 3 years, and a 20 thousand euro incentive for businesses in the mountains of Italy.

NASA is offering US$ 750,000 to people from anywhere in the world who solve a problem that could decide survival on Mars: creating food for astronauts without relying on resupply from Earth.

Belgium will sink 23 giant concrete caissons, each weighing 22,000 tons, in the North Sea to build the world’s first artificial energy island 45 km off the coast, forming offshore electrical walls.

New microwave that can replace three appliances hits the market: Sharp launches 3-in-1 model that combines air fryer, convection oven, and heating in 0.9 cubic feet for small kitchens

While Brazil has been discussing bullet trains for 16 years, China delivers 5 new high-speed lines in 2026, surpasses 50,000 km of HSR, and moves 1 billion passengers in a single year.

While countries spend billions to draw water from the sea, a Nobel-winning scientist creates a container-sized machine that extracts up to 1,000 liters per day from dry air and uses ultrasound to release water in minutes, even in the middle of the desert.

With an 88-meter wingspan, a capacity of 250 tons, six engines, and 32 wheels, the Ukrainian giant became the greatest symbol of extreme air transport and one of the most impressive machines in aviation history.

China achieves the “impossible,” transforms air into aviation fuel, and could be the solution to the airline industry’s cost pressures.

Hantavirus reignites alert in SC after a confirmed case in Seara, while the Andean variant linked to three deaths on a ship draws attention for its rare risk of human-to-human transmission.

Brazil is in the race for the artificial sun with tokamaks, public research, and a global billion-dollar competition that aims to transform plasma at 100 million degrees into clean, safe, and almost inexhaustible energy for the planet’s future.

Delayed FGTS will offer online consultation starting in June, and workers will be able to track pending amounts through the Regularize Portal without leaving home, in a change that promises to speed up forgotten deposits.

Appliances breaking quickly? The silly mistake many people make at home could be making you throw money away

Why Do Cars Make Noise When Shifting into Reverse? High-Pitched Noise Is a Direct Result of the Type of Gear Used Exclusively for This Function of the Transmission

Sharp Noise When Reversing Is Caused By The Straight-Toothed Gear Design, Unlike That Used In Normal Gears, Which Are Quieter And Smoother

A village with 115 inhabitants wants new residents: it offers a house, a job, up to 44 thousand euros in benefits, almost free rent, an annual grant of 8 thousand euros for 3 years, and a 20 thousand euro incentive for businesses in the mountains of Italy.

NASA is offering US$ 750,000 to people from anywhere in the world who solve a problem that could decide survival on Mars: creating food for astronauts without relying on resupply from Earth.

Belgium will sink 23 giant concrete caissons, each weighing 22,000 tons, in the North Sea to build the world’s first artificial energy island 45 km off the coast, forming offshore electrical walls.

New microwave that can replace three appliances hits the market: Sharp launches 3-in-1 model that combines air fryer, convection oven, and heating in 0.9 cubic feet for small kitchens

While Brazil has been discussing bullet trains for 16 years, China delivers 5 new high-speed lines in 2026, surpasses 50,000 km of HSR, and moves 1 billion passengers in a single year.

While countries spend billions to draw water from the sea, a Nobel-winning scientist creates a container-sized machine that extracts up to 1,000 liters per day from dry air and uses ultrasound to release water in minutes, even in the middle of the desert.

With an 88-meter wingspan, a capacity of 250 tons, six engines, and 32 wheels, the Ukrainian giant became the greatest symbol of extreme air transport and one of the most impressive machines in aviation history.

End of an era: the best-selling car in history, the Toyota Corolla, gets a farewell edition with bronze details, up to 18-inch wheels, a 2.0 naturally aspirated engine, and a 1.8 hybrid version before the new generation expected for 2027.

At the end of 2025, GWM brought to Brazil a diesel pickup truck without electrification, overturning the logic of Chinese hybrids and placing the Power Trail, the cheapest mid-size diesel pickup truck in Brazil for R$ 220,000, at the center of the fight with Ranger, S10, and Rampage.

China discovered the trick that Toyota used to conquer Europe, and now BYD, Chery, and other automakers are the world’s largest exporters.

Brazil’s cheapest car has installments of R$ 755 per month, a 1.0 engine with up to 71 hp, and fuel economy that exceeds 15 km/l to face Fiat Mobi and Citroën C3 in the popular Brazilian market; meet the Renault Kwid.

Truckers are now using an illegal trick to bypass toll collection with a device developed for drivers to evade monitoring.

China achieves the “impossible,” transforms air into aviation fuel, and could be the solution to the airline industry’s cost pressures.

Hantavirus reignites alert in SC after a confirmed case in Seara, while the Andean variant linked to three deaths on a ship draws attention for its rare risk of human-to-human transmission.

Brazil is in the race for the artificial sun with tokamaks, public research, and a global billion-dollar competition that aims to transform plasma at 100 million degrees into clean, safe, and almost inexhaustible energy for the planet’s future.

Delayed FGTS will offer online consultation starting in June, and workers will be able to track pending amounts through the Regularize Portal without leaving home, in a change that promises to speed up forgotten deposits.

Appliances breaking quickly? The silly mistake many people make at home could be making you throw money away